WO2008142045A1 - Hydrophobic surface coating for electronic and electro-technical components and uses thereof - Google Patents
Hydrophobic surface coating for electronic and electro-technical components and uses thereof Download PDFInfo
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- WO2008142045A1 WO2008142045A1 PCT/EP2008/056108 EP2008056108W WO2008142045A1 WO 2008142045 A1 WO2008142045 A1 WO 2008142045A1 EP 2008056108 W EP2008056108 W EP 2008056108W WO 2008142045 A1 WO2008142045 A1 WO 2008142045A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
Definitions
- the invention relates to a hydrophobic surface coating, in particular one for electronic and elektrotechni ⁇ cal components, which is simple and inexpensive to produce.
- the electrical contacts are connected by spreading surface wetting water condensates conductive, which is often used for
- fluorine-based coatings e.g., Teflon AF from DuPont,
- EGC1700 from 3M which are hydrophobic, but show a clear decrease of the contact angle, thus also of the hydrophobicity, at Wasserla ⁇ tion. In addition, they have none sufficient adhesion to the substrate and / or its mechanical resistance is low.
- hydrophobic additives for example waxes, hydrophobic Si02 powder and / or various types of Aerosil whose homogeneous incorporation into the coatings is difficult.
- the invention therefore provides a protective coating based on thermosetting plastics in the micropowder, nanoparticles and / or colloids, which, depending on their nature, have hydrophobic functional groups.
- thermosetting plastics are, for example, acrylic resins, especially isocyanate-crosslinked polyacrylic resins, polyurethane lacquers, such as, for example, FreiLacke EF-DEDUR UR 1040 (Emil Frei GmbH & Co) and / or clearcoats from Bayer AG, such as, for example, US Pat. the product RR4821 (Bayer AG).
- micropowders, nanoparticles and / or colloids are used, for example, in the form of prefabricated sols.
- the micropowder and / or the nanoparticles and / or colloids preferably comprise SiO 2 particles and / or boron nitride particles and are characterized by easy incorporation, stability in the paint matrix and optionally in sol-gel systems.
- the contact angles to water can be raised from approx. 80 ° to> 120 °.
- the Si0 2 nanoparticles and / or colloids are used, for example, in the form of prefabricated sols. These are, for example, commercially available and products from FEW Chemicals, Wolfen, Germany, such as the H4019, are used.
- a solvent-containing 2-component polyurethane coating (isocyanate-crosslinkable polyacrylic resin) are diluted (depending on the application) with up to 200 g of butyl acetate and stirred for 5 minutes. Thereafter, 1 to 1.5 g of the hydrophobically functionalized SiO 2 additive (H4019) are added and stirring is continued for a further 15 minutes. With this mixture test specimens are coated by dipping and / or spraying. The specimens are dried at RT for 5 h. The varnish cures after about 48 h / RT or after 2 h at 80 ° C.
- a solvent-containing 2-component polyurethane coating isocyanate-crosslinkable polyacrylic resin
- the finished paint mixture can be processed for about 6 hours at room temperature (pot life).
- the contact angle ge ⁇ gen water could be increased (with a contact angle ⁇ 85 °) to 110 ° compared to unmodified PU.
- the layer thicknesses of the protective lacquer layer can be set between 200nm and 500 ⁇ m, depending on the thickness of the lacquer thinning / processing.
- the hydrophobicity (BN) micropowder was increased in PU or Silikonla ⁇ CKEN also by incorporating boron nitride. As the BN concentration increases, the hydrophobicity of the paint surfaces increases.
- mention may be made of a polyurethane protective lacquer which has a contact angle of 83 ° without addition, while with a 10% by weight boron nitride additive a contact angle of 105 ° is achieved.
- Boron nitride micro powder may be incorporated in amounts of from 5 up to 60 wt% in the protective lacquer, preferably in amounts Zvi ⁇ rule 5 and 50% by weight, especially preferably in amounts between 10 and 35% by weight, as shown by the exemplary embodiment.
- PU coatings are well suited for outdoor applications and coatings in liquid media because of the high weather resistance.
- Coating composition 3.4 g Desmophen 670 (Bayer AG: formulation RR4821 or FreiLacke: EFDEDUR) 1.8 g Desmodur N3390 (Bayer), 20 g butyl acetate and 0.3 g H4019 (from FEW Chemi ⁇ cals.) Metal substrates were used as carriers.
- the long-term stability of the hydrophobic surface effect was demonstrated with coated metal platelets (layer thickness ⁇ 1 ⁇ m): After a storage time in water of 1000 hours, the contact angle of about 110 ° only decreases to values> 90 ° - the surface thus remains hydrophobic. For comparison: The contact angle of ordinary PU paints is about 85 ° and decreases during the aging to about 70 °.
- the SiO 2 modified PU coatings can be particularly advantageous in radio modules, for example, in RF modules, used who ⁇ because there in order to avoid interference, in principle, only very thin resist layers are applied of ⁇ 200 nm thickness.
- the protective coatings according to the invention offer complete protection even in these layer thicknesses.
- Example 3 Stuck electronic assemblies and / or sensor coatings for exterior and interior applications, for example in the automotive sector: acoustic wave sensor
- Coating composition 3.4 g of Desmophen 670, 1.8 g of Desmodur N3390 (Bayer), 45 g of butyl acetate and 0.3 g of H4019 (from FEW Chemiques).
- RF assemblies or sensors have been coated with the protective coating according to the invention.
- the contact angles of the protective coatings according to the invention are above 110 ° to water, although the invention may of course also include protective coatings with a lower contact angle.
- the hydrophobized nanoparticles can be incorporated by simply mixing in the paint components. Special mixing devices such as bead mills, torus mills etc. are not required.
- the distribution of the nanoparticles in the coating is very homogeneous since the particles are working as stable sols a ⁇ .
- a great advantage of the systems according to the invention is that the high contact angles of the BN-filled PU and silicone systems are maintained even at relatively high temperatures. Therefore, the application area, especially the PU coatings, significantly expanded.
- the inventive hydrophobic polyurethane coatings of industries where so far about 120 to 125 0 C at operating temperatures for applications in the automotive industry with operating temperatures of 150 0 C to 160 0 C in question.
- the high contact angles are maintained at temperatures above 200 ° C.
- the protective coatings according to the invention all pass the necessary creep current tests CTI 600.
- the protective coatings of the invention adhere well, for example on fiber composites, plastics, aluminum, steel, and similar substrates.
- the protective coating can also be applied in extremely thin layer thicknesses and eliminate full effect, so the protective lacquer may already be fully effective for example in a layer thickness in the range between 130 to 250 nm.
- the invention relates to a hydrophobic chestnbeschich- device, in particular one for electronic and electrotechnical ⁇ cal components, which is simple and inexpensive to produce.
- particles and micropowders are incorporated into the protective lacquer.
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Abstract
Description
Beschreibungdescription
Hydrophobe Oberflachenbeschichtung für elektronische und elektrotechnische Komponenten sowie Verwendungen dazuHydrophobic surface coating for electronic and electrical components as well as uses for it
Die Erfindung betrifft eine hydrophobe Oberflachenbeschichtung, insbesondere eine für elektronische und elektrotechni¬ sche Komponenten, die einfach und kostengünstig herstellbar ist.The invention relates to a hydrophobic surface coating, in particular one for electronic and elektrotechni ¬ cal components, which is simple and inexpensive to produce.
Herkömmliche Schutzlacke für elektronische und/oder elektro¬ technische Komponenten, wie z.B. elektronische Flachbaugruppen, Isolatoren und Komponenten im Bereich Bahnelektrifizierung und Energieübertragung auf der Basis von beispielsweise Alkyd, Epoxid, Polyurethan (PU) und/oder Silikon Materialien zeigen mit Ausnahme der Silikonlacke relativ hohe Oberflachenenergien. Die Kontaktwinkel gegen Wasser liegen in der Regel bei <80 °, Silikonlacke erreichen ca. 110°. Die meis¬ ten Lackoberflachen werden folglich mit Wasser leicht be- netzt.Conventional conformal coatings for electronic and / or electrical ¬ technical components, such as electronic printed circuit boards , insulators and components in the field of railway electrification and energy transfer based on, for example, alkyd, epoxy, polyurethane (PU) and / or silicone materials, with the exception of silicone coatings relatively high Surface energies. The contact angles to water are usually <80 °, silicone coatings reach about 110 °. The masters ¬ th lacquer surfaces are thus networked easy to load with water.
In feuchter Umgebung können beim Einsatz von unbeschichteten und mit Alkyd/Epoxiden etc. beschichteten Komponenten die elektrischen Kontakte durch spreitende oberflachenbenetzende Wasserkondensate leitend verbunden werden, was häufig zumIn wet environments, the use of uncoated and coated with alkyd / epoxies, etc. components, the electrical contacts are connected by spreading surface wetting water condensates conductive, which is often used for
Ausfall der Komponenten durch Kriechstrombildung fuhrt. Konventionelle Lacke, wie auch Silikonlacke, nehmen bei Wasser¬ lagerung Wasser auf. Durch Mikrorisse im Lack kann die Feuchte entsprechend tief eindringen und eine leitende Verbindung schaffen. Salze und Verunreinigungen erhohen dabei die Leitfähigkeit und damit die Gefahr einer elektrolytischen Korrosion von elektrotechnischen Komponenten wie beispielsweise Leiterbahnen und/oder Steckerkontakten.Failure of the components due to leakage current formation leads. Conventional coatings, as well as silicone coatings, take in water ¬ storage water. Due to micro-cracks in the paint, the moisture can penetrate correspondingly deep and create a conductive connection. Salts and impurities thereby increase the conductivity and thus the risk of electrolytic corrosion of electrotechnical components such as conductor tracks and / or plug contacts.
Es gibt fluorbasierte Überzüge (z.B. Teflon AF von DuPont,There are fluorine-based coatings (e.g., Teflon AF from DuPont,
EGC1700 von 3M) , die zwar hydrophob sind, aber bei Wasserla¬ gerung eine deutliche Abnahme des Kontaktwinkels, also auch der Hydrophobie, zeigen. Darüber hinaus besitzen sie keine ausreichende Haftung auf dem Substrat und/oder ihre mechanische Beständigkeit ist gering.EGC1700 from 3M), which are hydrophobic, but show a clear decrease of the contact angle, thus also of the hydrophobicity, at Wasserla ¬ tion. In addition, they have none sufficient adhesion to the substrate and / or its mechanical resistance is low.
Es gibt auch Hydrophob-Additive, beispielsweise Wachse, hydrophobiertes SiÜ2 Pulver und/oder diverse Aerosil-Typen, deren homogene Einarbeitung in die Lacke jedoch schwierig ist .There are also hydrophobic additives, for example waxes, hydrophobic Si02 powder and / or various types of Aerosil whose homogeneous incorporation into the coatings is difficult.
Deshalb ist es Aufgabe der Erfindung, eine hydrophobe Ober- flächenbeschichtung zu schaffen, die die Benetzung der Lacke mit Wasserkondensaten erschwert.It is therefore an object of the invention to provide a hydrophobic surface coating, which complicates the wetting of the paints with water condensates.
Die Lösung der Aufgabe und der Gegenstand der Erfindung sind in den Ansprüchen, der Beschreibung und den Beispielen offen- bart.The solution of the problem and the subject of the invention are disclosed in the claims, the description and the examples.
Gegenstand der Erfindung ist daher ein Schutzlack auf duroplastischer Kunststoffbasis in den Mikropulver, Nanoparti- kel und/oder Kolloide, die, je nach ihrer Natur, hydrophobe funktionelle Gruppen haben, eingearbeitet sind.The invention therefore provides a protective coating based on thermosetting plastics in the micropowder, nanoparticles and / or colloids, which, depending on their nature, have hydrophobic functional groups.
Schutzlacke auf duroplastischer Kunststoffbasis sind beispielsweise Acrylharze, insbesondere isocyanatvernetzte PoIy- acrylharze, Polyurethanlacke wie beispielsweise FreiLacke EF- DEDUR UR 1040 (Fa. Emil Frei GmbH & Co) und/oder Klarlacke der Fa. Bayer Ag, wie z.B. das Produkt RR4821 (Fa. Bayer AG).Protective lacquers based on thermosetting plastics are, for example, acrylic resins, especially isocyanate-crosslinked polyacrylic resins, polyurethane lacquers, such as, for example, FreiLacke EF-DEDUR UR 1040 (Emil Frei GmbH & Co) and / or clearcoats from Bayer AG, such as, for example, US Pat. the product RR4821 (Bayer AG).
Geeignete Mikropulver, Nanopartikel und/oder Kolloide werden beispielsweise in Form vorgefertigter Sole eingesetzt. Das Mikropulver und/oder die Nanopartikel und/oder Kolloide umfassen bevorzugt Siθ2-Partikel und/oder Bornitrid-Partikel und zeichnen sich durch leichte Einarbeitbarkeit, Stabilität in der Lackmatrix und gegebenenfalls in Sol-Gel Systemen aus.Suitable micropowders, nanoparticles and / or colloids are used, for example, in the form of prefabricated sols. The micropowder and / or the nanoparticles and / or colloids preferably comprise SiO 2 particles and / or boron nitride particles and are characterized by easy incorporation, stability in the paint matrix and optionally in sol-gel systems.
Die hydrophobe Funktionalisierung gelingt naturgemäß nur bei funktionalisierbaren Partikel und Mikropulver, beispielsweise Siθ2-Partikel und kann über alle gängigen hydrophoben Gruppen erfolgen, beispielsweise können folgende Funktionalitäten an SiÜ2 Partikeln vorgesehen sein: Methyl-, Octyl-, Phenyl-, Fluoralkyl-, wie z.B. SiC2H5CnF2n+I mit n=l-8.The hydrophobic functionalization naturally succeeds only in the case of functionalizable particles and micropowders, for example SiO 2 particles, and can take place via all common hydrophobic groups, for example the following functionalities can be used Si02 particles are provided: methyl, octyl, phenyl, fluoroalkyl, such as SiC 2 H 5 C n F 2n + I with n = 1-8.
Durch Einarbeiten von hydrophob funktionalisierten SiO2 Nano- partikel/Kolloide und/oder von Bornitridpartikel in Form vor¬ gefertigter Partikelsole und/oder Mikropulver in duroplastische Lackmatrices, werden hydrophobe Lackoberflächen mit niedrigen Oberflächenenergien erhalten.Particles / colloids and by incorporating hydrophobically functionalised SiO 2 nano / or boron nitride in the form manufactured before ¬ particle sols and / or micro-powder thermosetting Lackmatrices hydrophobic lacquer surfaces are obtained with low surface energies.
In Polyurethan-Systemen (PU) können die Kontaktwinkel gegenüber Wasser von ca. 80° auf >120° angehoben werden.In polyurethane systems (PU), the contact angles to water can be raised from approx. 80 ° to> 120 °.
Die Si02-Nanopartikel und/oder Kolloide werden z.B. in Form vorgefertigter Sole eingesetzt. Diese sind beispielsweise handelsüblich und Produkte der Firma FEW Chemicals, Wolfen, Deutschland, wie z.B. das H4019, werden eingesetzt.The Si0 2 nanoparticles and / or colloids are used, for example, in the form of prefabricated sols. These are, for example, commercially available and products from FEW Chemicals, Wolfen, Germany, such as the H4019, are used.
Die Rezeptur einer beispielhaften Ausführungsform lautet:The recipe of an exemplary embodiment is:
50g eines lösemittelhaltigen 2K-Polyurethanlackes (Isocyanat- vernetzbares Polyacrylharz) werden (je nach Anwendung) mit bis zu 200 g Butylacetat verdünnt und 5 min gerührt. Danach werden 1 - 1,5 g des hydrophob funktionalisierten SiO2- Additives (H4019) zugegeben und weitere 15 min gerührt. Mit dieser Mischung werden Probekörper durch Tauchen und/oder Besprühen beschichtet. Die Probekörper werden 5 h bei RT getrocknet. Der Lack härtet nach ca. 48 h /RT oder nach 2 h bei 80°C aus.50 g of a solvent-containing 2-component polyurethane coating (isocyanate-crosslinkable polyacrylic resin) are diluted (depending on the application) with up to 200 g of butyl acetate and stirred for 5 minutes. Thereafter, 1 to 1.5 g of the hydrophobically functionalized SiO 2 additive (H4019) are added and stirring is continued for a further 15 minutes. With this mixture test specimens are coated by dipping and / or spraying. The specimens are dried at RT for 5 h. The varnish cures after about 48 h / RT or after 2 h at 80 ° C.
Die fertige Lackmischung kann ca. 6 Stunden lang bei Raumtemperatur verarbeitet werden (Topfzeit) . Die Kontaktwinkel ge¬ gen Wasser konnten im Vergleich zu unmodifizierten PU (mit einem Kontaktwinkel <85°)auf über 110° gesteigert werden. Die Schichtdicken der Schutzlackschicht können je nach Lackver- dünnung/-Verarbeitung zwischen 200nm und 500μm eingestellt werden . Neben oder alternativ zu den hydrophob funktionalisierten SiO2-Partikeln konnte die Hydrophobie in PU- oder Silikonla¬ cken auch durch Einarbeiten von Bornitrid (BN) -Mikropulver erhöht werden. Mit steigender BN-Konzentration nimmt die Hyd- rophobie der Lackoberflachen zu. Beispielhaft genannt sei ein PolyUrethan-Schutzlack, der ohne Zusatz einen Kontaktwinkel von 83° hat, wahrend mit einem 10 Gewi Bornitrid-Zusatz ein Kontaktwinkel von 105° erreicht wird.The finished paint mixture can be processed for about 6 hours at room temperature (pot life). The contact angle ge ¬ gen water could be increased (with a contact angle <85 °) to 110 ° compared to unmodified PU. The layer thicknesses of the protective lacquer layer can be set between 200nm and 500μm, depending on the thickness of the lacquer thinning / processing. In addition or alternatively to the hydrophobically functionalised SiO 2 particles, the hydrophobicity (BN) micropowder was increased in PU or Silikonla ¬ CKEN also by incorporating boron nitride. As the BN concentration increases, the hydrophobicity of the paint surfaces increases. By way of example, mention may be made of a polyurethane protective lacquer which has a contact angle of 83 ° without addition, while with a 10% by weight boron nitride additive a contact angle of 105 ° is achieved.
Ahnliches wurde im Fall der Silikonlacke beobachtet, wo ein reiner Silikonlack (Powersil der Fa. Wacker AG) einen Kontaktwinkel von 95° (Glas) bzw. 105° (Stahl) hat und mit einem 10% Zusatz an Bornitrid auf einen Kontaktwinkel von 122° kommt. Diese Werte konnten sogar noch gesteigert werden, da ein Zusatz von 20 Gewi Bornitrid zu einem Kontaktwinkel von 130° führte und ein Zusatz von 30 Gewi Bornitrid einen Kon¬ taktwinkel von 135° bewirkte.The same was observed in the case of silicone coatings, where a pure silicone paint (Powersil from Wacker AG) has a contact angle of 95 ° (glass) or 105 ° (steel) and with a 10% addition of boron nitride to a contact angle of 122 ° comes. These values could even be increased, since an addition of 20 Gewi boron nitride led to a contact angle of 130 ° and an addition of 30 Gewi boron nitride caused a Kon ¬ contact angle of 135 °.
Bornitrid-Mikropulver kann in Mengen von 5 bis zu 60Gew% in den Schutzlack eingearbeitet sein, bevorzugt in Mengen zwi¬ schen 5 und 50 Gew%, insbesondere bevorzugt in Mengen zwischen 10 und 35 Gew%, wie die Ausfuhrungsbeispiels belegen.Boron nitride micro powder may be incorporated in amounts of from 5 up to 60 wt% in the protective lacquer, preferably in amounts Zvi ¬ rule 5 and 50% by weight, especially preferably in amounts between 10 and 35% by weight, as shown by the exemplary embodiment.
Im Folgenden wird die Erfindung anhand ausgewählter Ausfuh- rungsbeispiele naher erläutert:The invention will be explained in more detail below with reference to selected exemplary embodiments:
Grundsatzlich eignen sich PU-Lacke wegen der hohen Witte- rungsbestandigkeit gut für Außenanwendungen und Beschichtun- gen im flussigen Medium.In principle, PU coatings are well suited for outdoor applications and coatings in liquid media because of the high weather resistance.
Beispiel 1:Example 1:
Beschichtung von Metallen/Schutz in wassrigen Medien von E- lektronischen Baugruppen, Kondensatoren, Sensoren, Maschinenbau für die elektronische Ferti- gung/Bestuckung (Reflowofen, .. ) ,Coating of metals / protection in aqueous media of electronic assemblies, capacitors, sensors, mechanical engineering for electronic production / placement (reflow oven, ..),
Lackzusammensetzung: 3,4 g Desmophen 670 (Bayer AG: Formulierung RR4821 oder FreiLacke :EFDEDUR) 1,8g Desmodur N3390 (Fa. Bayer), 20g Butylacetat und 0,3g H4019 (Fa. FEW Chemi¬ cals. Als Trager wurden Metallsubstrate genommen.Coating composition: 3.4 g Desmophen 670 (Bayer AG: formulation RR4821 or FreiLacke: EFDEDUR) 1.8 g Desmodur N3390 (Bayer), 20 g butyl acetate and 0.3 g H4019 (from FEW Chemi ¬ cals.) Metal substrates were used as carriers.
Die Langzeitstabilitat des hydrophoben Oberflacheneffekts wurde mit beschichteten Metallplattchen (Schichtdicke <1 μm) nachgewiesen: Nach einer Lagerzeit in Wasser von 1000 Stunden nimmt der Kontaktwinkel von ca. 110° nur auf Werte > 90° ab - die Oberflache bleibt damit hydrophob. Zum Vergleich: Der Kontaktwinkel von gewohnlichen PU-Lacken liegt bei ca. 85° und sinkt wahrend der Auslagerung auf ca. 70° ab.The long-term stability of the hydrophobic surface effect was demonstrated with coated metal platelets (layer thickness <1 μm): After a storage time in water of 1000 hours, the contact angle of about 110 ° only decreases to values> 90 ° - the surface thus remains hydrophobic. For comparison: The contact angle of ordinary PU paints is about 85 ° and decreases during the aging to about 70 °.
Beispiel 2: Schutzlackierung von Elektronik-Flachbaugruppen:Example 2: Protective coating of electronic printed circuit boards:
Die Siθ2 modifizierten PU-Lacke können besonders vorteilhaft in Funkmodulen, beispielsweise in RF-Modulen, eingesetzt wer¬ den, da dort, um Interferenzen zu vermeiden, grundsatzlich nur sehr dünne Schutzlackschichten von <200 nm Dicke aufgebracht werden. Die erfindungsgemaßen Schutzlacke bieten aber bereits in diesen Schichtdicken vollständigen Schutz.The SiO 2 modified PU coatings can be particularly advantageous in radio modules, for example, in RF modules, used who ¬ because there in order to avoid interference, in principle, only very thin resist layers are applied of <200 nm thickness. However, the protective coatings according to the invention offer complete protection even in these layer thicknesses.
Ahnliches gilt für Sensorsysteme im Automobilbereich, beispielsweise bei Radarsensoren.The same applies to sensor systems in the automotive sector, for example in radar sensors.
Beispiel 3: bestuckte Elektronikbaugruppen und/oder Sensorbe- Schichtungen für Außen- und Innenanwendungen, beispielsweise im Automobilbereich: acoustic wave sensor)Example 3: Stuck electronic assemblies and / or sensor coatings for exterior and interior applications, for example in the automotive sector: acoustic wave sensor)
Lackzusammensetzung: 3,4 g Desmophen 670, 1,8g Desmodur N3390 (Fa. Bayer), 45 g Butylacetat und 0,3 g H4019 (Fa. FEW Chemi- cals) .Coating composition: 3.4 g of Desmophen 670, 1.8 g of Desmodur N3390 (Bayer), 45 g of butyl acetate and 0.3 g of H4019 (from FEW Chemiques).
Beispielsweise wurden Elektronikbaugruppen für die Automobil- Anwendungen mit definiertem Design, z.B: HF-Baugruppen oder Sensoren mit dem erfindungsgemaßen Schutzlack überzogen.For example, electronic assemblies for automotive applications with a defined design, for example: RF assemblies or sensors have been coated with the protective coating according to the invention.
Diese Module bestehen die geforderten Betauungstests nach IEC 60068-2-38 bzw. IEC 60068-2-78 nur mit den SiO2 modifizierten PU-Beschichtungen . Nach der Beschichtung der Elektronikbau- gruppen (Schichtdicke 170 nm) liegen die Kontaktwinkel einer erfindungsgemäßen Beschichtung bei 110°.These modules pass the required condensation tests according to IEC 60068-2-38 or IEC 60068-2-78 only with the SiO 2 modified PU coatings. After coating the electronic components Groups (layer thickness 170 nm) are the contact angle of a coating according to the invention at 110 °.
Erfindungsgemäß beschichtete Sensoren (AWS, Simaf) zeigen auch gegenüber dem Stand der Technik deutlich bessere Werte.Sensors coated according to the invention (AWS, Simaf) also show significantly better values compared to the prior art.
Die Erfindung weist eine Reihe von Vorteilen gegenüber dem Stand der Technik auf:The invention has a number of advantages over the prior art:
Zum einen werden sehr hohe Kontaktwinkel realisiert, in der Regel liegen die Kontaktwinkel der erfindungsgemäßen Schutzlacke bei über 110° gegen Wasser, obwohl die Erfindung natürlich unter Umständen auch Schutzlacke mit geringerem Kontaktwinkel umfassen kann.On the one hand, very high contact angles are realized, as a rule the contact angles of the protective coatings according to the invention are above 110 ° to water, although the invention may of course also include protective coatings with a lower contact angle.
Zum zweiten handelt es sich um eine kostengünstige Variante zur Herstellung der Schutzlacke, da nur geringe Mengen, bei¬ spielsweise 1 bis 10 Gew%, bevorzugt 3 bis 7 Gew% und insbe¬ sondere bevorzugt bis zu 5 Gew% an hydrophoben SiÜ2 Nanoteil- chen benötigt werden.Secondly, it is an affordable option for forming the protective coatings, since only small amounts, at ¬ play, 1 to 10 wt%, preferably 3 to 7% by weight and in particular ¬ sondere preferably up to 5% by weight of hydrophobic SiO 2 Nanoteil- chen needed.
Die hydrophobierten Nanopartikel können durch einfaches Einmischen in die Lackkomponenten eingearbeitet werden. Spezielle Mischvorrichtungen wie z.B. Perlmühlen, Torusmühlen etc. sind nicht erforderlich. Die Verteilung der Nanopartikel im Lack ist sehr homogen, da die Partikel als stabile Sole ein¬ gearbeitet werden.The hydrophobized nanoparticles can be incorporated by simply mixing in the paint components. Special mixing devices such as bead mills, torus mills etc. are not required. The distribution of the nanoparticles in the coating is very homogeneous since the particles are working as stable sols a ¬.
Ein großer Vorteil der erfindungsgemäßen Systeme ist, dass die hohen Kontaktwinkel der BN-gefüllten PU und Silikonsysteme auch bei höheren Temperaturen erhalten bleiben. Daher ist der Einsatzbereich, insbesondere der PU-Lacke, deutlich erweitert. So wird mit den erfindungsgemäßen hydrophoben PU- Lacken der Einsatzbereichen von bisher ca. 120-1250C auf Be- triebstemperaturen für Anwendungen im Automobilbereich mit Betriebstemperaturen von 1500C bis 1600C in Frage. Bei BN dotierten Silikonlacken bleiben die hohen Kontaktwinkel bei Temperaturen von über 2000C erhalten.A great advantage of the systems according to the invention is that the high contact angles of the BN-filled PU and silicone systems are maintained even at relatively high temperatures. Therefore, the application area, especially the PU coatings, significantly expanded. Thus, with the inventive hydrophobic polyurethane coatings of industries where so far about 120 to 125 0 C at operating temperatures for applications in the automotive industry with operating temperatures of 150 0 C to 160 0 C in question. For BN-doped silicone coatings, the high contact angles are maintained at temperatures above 200 ° C.
Die erfindungsgemäßen Schutzlacke bestehen alle die erforder- liehen Kriechstromtests CTI 600.The protective coatings according to the invention all pass the necessary creep current tests CTI 600.
Zudem haften die erfindungsgemäßen Schutzlacke gut, beispielsweise auf Faserverbundwerkstoffen, Kunststoffen, Aluminium, Stahl, und ähnlichen Substraten.In addition, the protective coatings of the invention adhere well, for example on fiber composites, plastics, aluminum, steel, and similar substrates.
Deshalb kann der Schutzlack auch in extrem dünnen Schichtdicken aufgetragen werden und volle Wirkung entfallen, so kann der Schutzlack beispielsweise in einer Schichtdicke im Bereich zwischen 130 bis 250 nm bereits voll wirksam sein.Therefore, the protective coating can also be applied in extremely thin layer thicknesses and eliminate full effect, so the protective lacquer may already be fully effective for example in a layer thickness in the range between 130 to 250 nm.
Die Erfindung betrifft eine hydrophobe Oberflächenbeschich- tung, insbesondere eine für elektronische und elektrotechni¬ sche Komponenten, die einfach und kostengünstig herstellbar ist. Dazu werden Partikel und Mikropulver, insbesondere hyd- rophobe Partikel, in den Schutzlack eingearbeitet. The invention relates to a hydrophobic Oberflächenbeschich- device, in particular one for electronic and electrotechnical ¬ cal components, which is simple and inexpensive to produce. For this purpose, particles and micropowders, in particular hydrophobic particles, are incorporated into the protective lacquer.
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08759734A EP2158275B1 (en) | 2007-05-21 | 2008-05-19 | Hydrophobic surface coating for electronic and electro-technical components and uses thereof |
| AT08759734T ATE543882T1 (en) | 2007-05-21 | 2008-05-19 | HYDROPHOBIC SURFACE COATING FOR ELECTRONIC AND ELECTROTECHNICAL COMPONENTS AND USES THEREOF |
| US12/601,172 US20100249306A1 (en) | 2007-05-21 | 2008-05-19 | Hydrophobic surface coating for electronic and electro-technical components and uses thereof |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007023555.2 | 2007-05-21 | ||
| DE102007023555A DE102007023555A1 (en) | 2007-05-21 | 2007-05-21 | Hydrophobic surface coating for electronic and electrical components as well as uses for it |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008142045A1 true WO2008142045A1 (en) | 2008-11-27 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/056108 Ceased WO2008142045A1 (en) | 2007-05-21 | 2008-05-19 | Hydrophobic surface coating for electronic and electro-technical components and uses thereof |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20100249306A1 (en) |
| EP (1) | EP2158275B1 (en) |
| AT (1) | ATE543882T1 (en) |
| DE (1) | DE102007023555A1 (en) |
| WO (1) | WO2008142045A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011151151A1 (en) * | 2010-05-31 | 2011-12-08 | Siemens Aktiengesellschaft | Hydrophobic coating and use thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008048874A1 (en) * | 2008-09-25 | 2010-04-08 | Siemens Aktiengesellschaft | Coatings for electronic circuits |
| US9689825B1 (en) | 2013-09-09 | 2017-06-27 | Apple Inc. | Testing a layer positioned over a capacitive sensing device |
| US9622357B2 (en) * | 2014-05-06 | 2017-04-11 | Apple Inc. | Method for orienting discrete parts |
| US9734927B2 (en) | 2015-04-09 | 2017-08-15 | International Business Machines Corporation | Optical capture and isolation of circulating tumor cells in a micro-fluidic device utilizing size selective trapping with optical cogwheel tweezers |
| US20160368821A1 (en) | 2015-06-17 | 2016-12-22 | International Business Machines Corporation | Method of glass fabric production including resin adhesion for printed circuit board formation |
| US9739696B2 (en) | 2015-08-31 | 2017-08-22 | Apple Inc. | Flexural testing apparatus for materials and method of testing materials |
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| US20020137872A1 (en) * | 2000-12-08 | 2002-09-26 | Schneider John R. | Coating compositions providing improved mar and scratch resistance and methods of using the same |
| DE10139574A1 (en) * | 2001-08-10 | 2003-02-20 | Creavis Tech & Innovation Gmbh | Maintaining the lotus effect by preventing microbial growth on self-cleaning surfaces |
| CN100339445C (en) * | 2003-04-07 | 2007-09-26 | 章浩龙 | Nano silicon dioxide emulsion, its preparation method and application |
| EP1533356A1 (en) * | 2003-11-24 | 2005-05-25 | 3M Innovative Properties Company | Fluorochemical composition for rendering substrates oil and/or water repellent |
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2007
- 2007-05-21 DE DE102007023555A patent/DE102007023555A1/en not_active Withdrawn
-
2008
- 2008-05-19 WO PCT/EP2008/056108 patent/WO2008142045A1/en not_active Ceased
- 2008-05-19 US US12/601,172 patent/US20100249306A1/en not_active Abandoned
- 2008-05-19 AT AT08759734T patent/ATE543882T1/en active
- 2008-05-19 EP EP08759734A patent/EP2158275B1/en not_active Not-in-force
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| US6495624B1 (en) * | 1997-02-03 | 2002-12-17 | Cytonix Corporation | Hydrophobic coating compositions, articles coated with said compositions, and processes for manufacturing same |
| WO2004104116A1 (en) * | 2003-05-20 | 2004-12-02 | Dsm Ip Assets B.V. | Hydrophobic coatings comprising reactive nano-particles |
| EP1432285A2 (en) * | 2003-12-30 | 2004-06-23 | Phonak Ag | Hydrophobic coating of individual hearing aid components |
| DE102006030054A1 (en) * | 2006-06-29 | 2008-01-03 | Evonik Degussa Gmbh | Anti-fouling coating and process for its preparation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011151151A1 (en) * | 2010-05-31 | 2011-12-08 | Siemens Aktiengesellschaft | Hydrophobic coating and use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2158275B1 (en) | 2012-02-01 |
| EP2158275A1 (en) | 2010-03-03 |
| ATE543882T1 (en) | 2012-02-15 |
| US20100249306A1 (en) | 2010-09-30 |
| DE102007023555A1 (en) | 2008-11-27 |
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